Doubt with dotted line

[cesroc]

Hello,

My application is plotting graphs with line style and then there is a configuration dialog where the user can add dots on this lines. But when I press the checkbox to create the dots, nothing happens, my graph keeps the same. The part that I plot the graph is:

// Insert new curves
curveArray[iGraphCounter].setAxes(QwtPlot::xBottom,QwtPlot::yLeft+iGraphCounter);
curveArray[iGraphCounter].setTitle(object->legend.c_str());
curveArray[iGraphCounter].setRenderHint(QwtPlotItem::RenderAntialiased);
curveArray[iGraphCounter].setLegendAttribute(QwtPlotCurve::LegendShowLine, true);
 
curveArray[iGraphCounter].setPen(QColor(iColorMap[iGraphCounter][0],iColorMap[iGraphCounter][1],iColorMap[iGraphCounter][2],iColorMap[iGraphCounter][3]));
curveArray[iGraphCounter].setStyle(QwtPlotCurve::Lines);
curveArray[iGraphCounter].setRawSamples(&object->xContent[0],&object->yContent[0],object->xContent.size());
curveArray[iGraphCounter].attach(plot);

// Insert new curves
curveArray[iGraphCounter].setAxes(QwtPlot::xBottom,QwtPlot::yLeft+iGraphCounter);
curveArray[iGraphCounter].setTitle(object->legend.c_str());
curveArray[iGraphCounter].setRenderHint(QwtPlotItem::RenderAntialiased);
curveArray[iGraphCounter].setLegendAttribute(QwtPlotCurve::LegendShowLine, true);

curveArray[iGraphCounter].setPen(QColor(iColorMap[iGraphCounter][0],iColorMap[iGraphCounter][1],iColorMap[iGraphCounter][2],iColorMap[iGraphCounter][3]));
curveArray[iGraphCounter].setStyle(QwtPlotCurve::Lines);
curveArray[iGraphCounter].setRawSamples(&object->xContent[0],&object->yContent[0],object->xContent.size());
curveArray[iGraphCounter].attach(plot);

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When the user press the combox to add the dots, the application goes to this part:

if (dotLinesCheckBox->isChecked())
{
	for (int i=0; i<iGraphCounter; i++)
	{
		curveArray[iGraphCounter].setSymbol(new QwtSymbol ( QwtSymbol::Ellipse , QBrush(curveArray[iGraphCounter].pen().color()), QPen(curveArray[iGraphCounter].pen().color()), QSize(5,5)));
	}
}
else
{
	for (int i=0; i<iGraphCounter; i++)
	{
		curveArray[iGraphCounter].setSymbol(new QwtSymbol ( QwtSymbol::NoSymbol , QBrush(curveArray[iGraphCounter].pen().color()), QPen(curveArray[iGraphCounter].pen().color()), QSize(5,5)));
	}
}
plot->replot();

if (dotLinesCheckBox->isChecked())
{
	for (int i=0; i<iGraphCounter; i++)
	{
		curveArray[iGraphCounter].setSymbol(new QwtSymbol ( QwtSymbol::Ellipse , QBrush(curveArray[iGraphCounter].pen().color()), QPen(curveArray[iGraphCounter].pen().color()), QSize(5,5)));
	}
}
else
{
	for (int i=0; i<iGraphCounter; i++)
	{
		curveArray[iGraphCounter].setSymbol(new QwtSymbol ( QwtSymbol::NoSymbol , QBrush(curveArray[iGraphCounter].pen().color()), QPen(curveArray[iGraphCounter].pen().color()), QSize(5,5)));
	}
}
plot->replot();

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I think it's because my curves are already attached and then I cannot change. But I'm not sure. And if what I think it's true, how can I make it?
How can I plot a graph with lines and then later add dots to the lines?

Thanks in advance
Best Regards

[Uwe]

You have to modify the curve pen ( QwtPlotCurve::setPen() ) - this is not the same pen as the pen of its symbol.

Uwe

[cesroc]

Thanks Uwe, but the problem was another thing. It was a really stupid thing. If you check the code part I inserted before you're gonna see that my loop is using the variable "i", but inside of my loop I didn't change and I was using the variable "iGraphCounter", that's why it was not working, when I changed everything works fine.
Thanks anyways.